package com.baoxin.filter;

import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;

import java.util.Arrays;
import java.util.List;
import java.util.function.Consumer;


/**
 *  自定义局部过滤器
 *
 *
 *
 *
 */
@Component
public class MyParamGatewayFilterFactory extends AbstractGatewayFilterFactory<MyParamGatewayFilterFactory.Config> {

    static final String PARAM_NAME = "param"  ;

    public MyParamGatewayFilterFactory(){
        super(Config.class);
    }

    public List<String> shortcutFieldOrder(){
        return Arrays.asList(PARAM_NAME);
    }



    @Override
    public GatewayFilter apply(Config config) {

        return ((exchange, chain) -> {
            // 获取请求参数中param 对应的参数名 的参数值
            ServerHttpRequest request = exchange.getRequest();

            if(request.getQueryParams().containsKey(config.param)){
                request.getQueryParams().get(config.param).forEach(value -> System.out.printf("-------------局部过滤器-----%s = %s ------",config.param, value));
            }
            return chain.filter(exchange);
        });
    }

    public static class Config{

        private String param ;

        public String getParam() {
            return param;
        }

        public void setParam(String param) {
            this.param = param;
        }
    }
}
